A method in a wireless communication transmitter including a baseband processor (310) that configures the transmitter for a particular signal configuration, and a headroom controller (350) for adjusting transmitter headroom based on the particular signal configuration. In one embodiment, the headroom is controlled based on a power metric, for example, a 3rd order polynomial or a peak to average ratio (PAR) metric, that is a function of the signal configuration. In another embodiment, the headroom is adjusted using information in a look up table.
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1. A method in a wireless communication transmitter, the method comprising: determining transmitter headroom based on a particular signal configuration using a look up table; configuring the wireless communication transmitter for the particular signal configuration after determining the transmitter headroom; adjusting transmitter headroom for the particular signal configuration based on the transmitter headroom determined using the look up table.
A wireless transmitter adjusts its headroom based on the signal configuration. This is done by first determining the necessary headroom using a lookup table that maps signal configurations to headroom values. The transmitter is then configured for the specified signal type (e.g., modulation scheme, channel bandwidth). Finally, the transmitter's headroom is adjusted to the value obtained from the lookup table for that specific signal configuration. This process optimizes power efficiency by tailoring the headroom to the signal requirements.
2. The method of claim 1 , determining transmitter headroom based on the particular signal configuration and based on signal power considerations using the look up table.
The wireless transmitter adjusts its headroom based on the signal configuration, using a lookup table to determine the initial headroom value. As in the previous description, the lookup table maps signal configurations to appropriate headroom values. The headroom determination also takes into account signal power considerations, such as the desired transmit power or the power amplifier's operating point. The lookup table incorporates this power information to provide a more accurate headroom value for the given signal configuration and power level, enabling finer-grained power management.
3. The method of claim 1 , adjusting at least one of wireless communication device transmitter supply voltage, bias and load based on the particular signal configuration.
The wireless transmitter adjusts its headroom based on the signal configuration as in the first description. After determining the appropriate transmitter headroom based on the signal configuration, the transmitter adjusts the supply voltage, bias, or load of the transmitter components. This adjustment optimizes power consumption and signal fidelity. For example, the supply voltage to the power amplifier could be lowered for signal configurations with lower peak-to-average power ratios, or the bias current could be adjusted to improve linearity for certain modulation schemes, or load impedance can be adapted.
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September 30, 2004
August 27, 2013
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